A series of pyrimidine annulated dihydropyrano[2, 3-c]pyrazole derivatives were synthesized and screened for their antimicrobial activity. The precursor, dihydropyrano[2, 3-c]pyrazole was synthesised under catalyst free condition using PEG-400 as reaction medium which facilitated improved yield compared to base catalyzed reaction. Wide scope of substrates, simple workup procedure and high yield even in the absence of catalyst are the major highlights of the protocol. Dihydropyrano[2, 3-c]pyrazoles on condensation with formic acid formed pyrimidine annulated dihydropyrano[2, 3-c]pyrazole derivatives. All the products are characterized using FTIR, $^1H-NMR$ and $^13}C-NMR$ spectroscopic techniques. The molecules have shown good to moderate activity as antimicrobial agents when compared to the standard drug ciprofloxacin.
一系列
吡啶并
吡喃[2, 3-c]并
二氢吡唑嘧啶衍
生物被合成并进行了抗菌活性筛选。前体物
吡喃并
吡喃[2, 3-c]并
二氢吡唑在无催化剂条件下以P
EG-400为反应介质合成,相比碱催化反应,产率有所提高。该合成方法的主要亮点在于广泛的底物适应性、简单的后处理过程以及即使在无催化剂的情况下也能保持高产率。
吡喃并
吡喃[2, 3-c]并
二氢吡唑与
甲酸缩合生成了
吡啶并
吡喃[2, 3-c]并
二氢吡唑嘧啶衍
生物。所有产品均通过傅里叶变换红外光谱(FTIR)、
$^1H-NMR$ 和
$^13}C-NMR$ 光谱技术进行了表征。与标准药物
环丙沙星相比,这些分子展现出良好的至中等的抗菌活性。